It's because cloudflare is down.

There was a recent Cloudflare outage which comes as Amazon Web Services (AWS) and Microsoft Azure had earlier outages also which caused some major disruptions. Sites like this has news about the outages. https://www.livemint.com/technology/tech-news/triple-shocker-how-aws-cloudflare-and-microsoft-outages-sent-ripples-across-the-web-11763484865558.html Also there is sure a Lot of scheduled maintenance and re-routing going on with Cloudflare as per https://www.cloudflarestatus.com/ so there could still be some slight issues depending on where you are.